linux-kernel - Re: [PATCH 24/24] debugfs: Restrict debugfs when the kernel is locked down

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Message-ID: <12769.1523477356@warthog.procyon.org.uk>
Date:   Wed, 11 Apr 2018 21:09:16 +0100
From:   David Howells <dhowells@...hat.com>
To:     Greg KH <greg@...ah.com>
Cc:     dhowells@...hat.com, torvalds@...ux-foundation.org,
        linux-man@...r.kernel.org, linux-api@...r.kernel.org,
        jmorris@...ei.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH 24/24] debugfs: Restrict debugfs when the kernel is locked down

Greg KH <greg@...ah.com> wrote:

> Why not just disable debugfs entirely?  This half-hearted way to sorta
> lock it down is odd, it is meant to not be there at all, nothing in your
> normal system should ever depend on it.
> 
> So again just don't allow it to be mounted at all, much simpler and more
> obvious as to what is going on.

Yeah, I agree - and then I got complaints because it seems that it's been
abused to allow drivers and userspace components to communicate.

David